1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2020 Marvell International Ltd. All rights reserved */
#include <linux/kernel.h>
#include <linux/list.h>
#include "prestera.h"
#include "prestera_hw.h"
#include "prestera_acl.h"
#include "prestera_flow.h"
#include "prestera_span.h"
struct prestera_span_entry {
struct list_head list;
struct prestera_port *port;
refcount_t ref_count;
u8 id;
};
struct prestera_span {
struct prestera_switch *sw;
struct list_head entries;
};
static struct prestera_span_entry *
prestera_span_entry_create(struct prestera_port *port, u8 span_id)
{
struct prestera_span_entry *entry;
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return ERR_PTR(-ENOMEM);
refcount_set(&entry->ref_count, 1);
entry->port = port;
entry->id = span_id;
list_add_tail(&entry->list, &port->sw->span->entries);
return entry;
}
static void prestera_span_entry_del(struct prestera_span_entry *entry)
{
list_del(&entry->list);
kfree(entry);
}
static struct prestera_span_entry *
prestera_span_entry_find_by_id(struct prestera_span *span, u8 span_id)
{
struct prestera_span_entry *entry;
list_for_each_entry(entry, &span->entries, list) {
if (entry->id == span_id)
return entry;
}
return NULL;
}
static struct prestera_span_entry *
prestera_span_entry_find_by_port(struct prestera_span *span,
struct prestera_port *port)
{
struct prestera_span_entry *entry;
list_for_each_entry(entry, &span->entries, list) {
if (entry->port == port)
return entry;
}
return NULL;
}
static int prestera_span_get(struct prestera_port *port, u8 *span_id)
{
u8 new_span_id;
struct prestera_switch *sw = port->sw;
struct prestera_span_entry *entry;
int err;
entry = prestera_span_entry_find_by_port(sw->span, port);
if (entry) {
refcount_inc(&entry->ref_count);
*span_id = entry->id;
return 0;
}
err = prestera_hw_span_get(port, &new_span_id);
if (err)
return err;
entry = prestera_span_entry_create(port, new_span_id);
if (IS_ERR(entry)) {
prestera_hw_span_release(sw, new_span_id);
return PTR_ERR(entry);
}
*span_id = new_span_id;
return 0;
}
static int prestera_span_put(struct prestera_switch *sw, u8 span_id)
{
struct prestera_span_entry *entry;
int err;
entry = prestera_span_entry_find_by_id(sw->span, span_id);
if (!entry)
return false;
if (!refcount_dec_and_test(&entry->ref_count))
return 0;
err = prestera_hw_span_release(sw, span_id);
if (err)
return err;
prestera_span_entry_del(entry);
return 0;
}
int prestera_span_rule_add(struct prestera_flow_block_binding *binding,
struct prestera_port *to_port,
bool ingress)
{
struct prestera_switch *sw = binding->port->sw;
u8 span_id;
int err;
if (binding->span_id != PRESTERA_SPAN_INVALID_ID)
/* port already in mirroring */
return -EEXIST;
err = prestera_span_get(to_port, &span_id);
if (err)
return err;
err = prestera_hw_span_bind(binding->port, span_id, ingress);
if (err) {
prestera_span_put(sw, span_id);
return err;
}
binding->span_id = span_id;
return 0;
}
int prestera_span_rule_del(struct prestera_flow_block_binding *binding,
bool ingress)
{
int err;
err = prestera_hw_span_unbind(binding->port, ingress);
if (err)
return err;
err = prestera_span_put(binding->port->sw, binding->span_id);
if (err)
return err;
binding->span_id = PRESTERA_SPAN_INVALID_ID;
return 0;
}
int prestera_span_init(struct prestera_switch *sw)
{
struct prestera_span *span;
span = kzalloc(sizeof(*span), GFP_KERNEL);
if (!span)
return -ENOMEM;
INIT_LIST_HEAD(&span->entries);
sw->span = span;
span->sw = sw;
return 0;
}
void prestera_span_fini(struct prestera_switch *sw)
{
struct prestera_span *span = sw->span;
WARN_ON(!list_empty(&span->entries));
kfree(span);
}
|
